Molder&#39;s flask



Oct. 25, 1932. G' KRAMER 1,883,963

MOLDER S FLASK Filed Oct. 1, 1929 4 Sheets-Sheet l IIIIIIII 1 "mm"nu-"u...

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MQLDER'S FLASK Filed Oct. 1, 1929 4 Sheets-Sheef 2 G. H. KRAMER1,883,963

' MOLDERS FLASK Filed Oct. 1. 1925 4 Sheets-Sheet 5 Oct. 25, 1932.

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Patented Oct. 25, 1932 UNITED STATES PATENT OFFIQE GEORGE HENRY KRAMER,OF DAYTON, OHIO, ASSIGNOR, TO KRAMER- BROTHERS FOUNDRY COMPANY, OFDAYTON, OHIO, A CORPORATION 03. OHIO MOLDER S FLASK Application filedOctober 1, 1929.

This invention relates to foundry practice and more particularly to amolders flask embodying interchangeable and relatively adjustable sandanchor or lifting bars and detachable trunnions.

The wooden foundry flask commonly used is provided at spaced intervalswith transverse wooden bars particularly in the cope and cheek sections.Some of these wooden anchor bars extend entirely across the flask, whileothers are comparatively short, projecting inwardly from the sides ofthe flask and terminating in spaced relation therewith. WVhen a molderfinds that the wooden bars in the flask section to be used interferewith the pattern to be embedded in the sand, he chops away more or lessof the anchor bars or knocks the bar loose from the flask and removes itentirely. The frequent removal and replacement of such bars which arenailed to the flask walls causes injury to the flask and rapidly rendersit unfit for use. Such practice further necessitates the employment of amillwright for the repair of flasks and replacement of multilated andremoved bars. For the purpose of affording secure anchorage engagementfor the sand mold, numerous nails are driven into such anchor bars,particularly into the lower margin and are bent in various directions.Not infrequently these nails cause painful injury to the molders fingerswhen tucking sand beneath the anchor bars preparatory to ramming up amold.

In the present invention there is contemplated the use of cast metalsand anchor or lifting bars with coupling means by which the bars may beinterengaged with the flask at any desired point. The metallic anchorbars are of various shapes and sizes so that the molder by selection mayassemble such anchor bars within. the flask in any desired relation withthe pattern to be embedded. As will be later pointed out and as shown inthe drawings, some of these anchor bars are strai ht, extending acrossthe flask, while others are comparatively short forming wings projectinginwardly from one side or another of a flask, while still other anchormembers are of circular or rectangular form.

Serial No. 396,575.

lVith a variety of such anchor bars or lifting members to select from, aflask may be accurately accommodated to patterns of various irregularshapes, which is substantially impossible with the usual molders flaskhaving permanently secured anchor bars.

Moreover, the use of the rectangular or circular sand supporting elementserves to confine the sand of the mold about the pattern in instanceswhere the casting to be produced has some large open area, and obviatesthe necessity for filling such open area with molding sand. This notonly affords a saving in sand but also in the labor and time necessaryto ram sand over such large area in preparing the mold.

Flasks of large size are ordinarily picked up by an overhead crane orother lifting device for movement about a molding floor and for reversalduring the preparation of the mold. To this end, flasks are ordinarilyprovided with lateral trunnions about which they may be turned whenelevated off the molding floor. The flasks containing completed moldsare set side by side upon the floor preparatory to pouring the moltenmetal. To save space it is desirable that the flasks be set closelytogether. However, the lateral trunnions ordinarily interfere with theclose spacing of the flasks. The present flask is provided withdetachable trunnions which are removab-ly engaged in sockets carried bythe side walls of the flask, the removal of which permits the flasks tobe located quite closely together.

The object of the invention is to improve the structure as well as themeans and mode of operation of molders flasks whereby they will'not onlybe cheapened in construction, but will be more eflicient in use, moreconvenient, easily adaptable to patterns of different shapes andproportions, of greater durability, and unlikely to get out of repair.

A further object of the invention. is to provide an improved form ofinterchangeable and relatively adjustable anchor bars or lifting barsfor molders flasks and to provide improved means for detachablyconnecting such bars in various relative positions.

A further object of the invention is to provide improved mounting meansfor sand anchor or lifting bars for molders flasks whereby the bars maybe adjusted longitudinally of the flask and fixedly engaged 111 anyposition of such adjustment.

A further and important object of the invention is to provide means forconfining the sand of molds for castings having large open areas wh rebysuch molds may be made with minimum quantity of sand and minimum laboreffort.

A further object of the invention is to provide improved venting meansfor molders flasks and to further provide an improved form of run-outstrip for such flasks.

further object of the invention is to provide an improved trunnion andmounting therefor from which the trunnion is detachable.

With the above primary and other incidental objects in view, as willmore fully appear in the specification, the invention consists of thefeatures of construction, the parts and combination thereof and the modeof operation on their equivalents as hereinafter described and set forthin the claims.

Referring to the accompanying drawings wherein is sh own the preferredbut obviously not necessarily the only form of embodiment of theinvention, Fig. 1 is a perspective view of section of a molders flask towhich the present invention has been applied.

Fig. 2 is an enlarged detail sectional View illustrating the method ofdetachably coupling the different forms of anchor bars with he flaskwall.

Fig. 3 is a perspective view of a section of a molders flask, showingtherein a circular anchor or lifting element and further illustrating amodified means for coupling such anchor element with the side wall ofthe flask.

Fig. 4t is a vertical sectional view of a mold formed within a flaskemploying the present anchor or lifting bars.

F 5 is a top plan view of the flask with the pattern located therein,illustrating an assembly of anchor or lifting bars of various shapes.

Fig. (3 is a perspective View partly broken away of a sand mold forcasting a rectangular frame having a large central open area.

Fig. 7 is an enlarged detail sectional view of the coupling meansillustrated in Fig. 3.

Figure 8 is a vertical section showing an extreme adjustment of theanchor member shown in Figure 3.

Figure 9 is a plan View of the corner plate and anchoring arrangementpartially shown in Figure 3.

Figure 10 is an enlarged perspective of a corner plate.

Like parts are indicated by similar characters of reference throughoutthe several views.

Referring to the accompanying drawings, 1 indicates the cope or topsection of an ordinary molders flask and comprises a rectangularbottomless box-like enclosure of wooden planks within which a body ofmolding sand is to be tamped about a pattern to form a mold. Such bodiesof sand forming the mold, when of large size, are not self-supporting,and when the flask is lifted such body of sand is likely to fall out ifnot provided with suitable anchorage. The ordinary practice is toprovide wooden slats or bars at spaced intervals to afford the necessaryanchorage and support for the body of sand. However, as before pointedout, such flasks with permanently located anchor bars require frequentrevision and change by cutting away or rcmoval of such bars toaccommodate the flask to patterns of different shapes and dimensions. Inthe present instance, in lieu of such permanently fixed anchor orlifting bars, interchangeable and relatively adjustable bars areprovided. These anchor or lifting bars may be formed in a very widevariety of shapes and sizes, a comparatively few of which have beenillustrated in the drawings. One of the most commonly used form of barsis that illustrated at 2, which comprises a frame-like body having atits top margin laterally projecting flanges 3, and at its lower margintriangular ribs l. The marginal ribs 4 are preferably indented orroughened as at 5 to afford increased anchorage engagement of thecompacted or tampcd body of sand forming the mold. Such bars 2 areprovided with openings 6 through which the compressed body of mold sandextends into continuity with the portion of the body beyond the anchorbar. At their opposite ends, the bars 2 are provided with ex end-ed arms7, which overhang the side planks of the flask. Such arms 7 may beformed integral with the anchor bars 2 or may be independently formedfrom wrought iron or steel and riveted, welded or bolted to the body ofthe bar Such anchor bars 2 may be of various shapes and dimensions. Someof these bars extend approximately from one side wall to the other ofthe flask 1 and also approximately from the top to the bottom of suchflask section. Other bars of similar design may be differentlyproportioned so that they terminate in widely spaced relation with onewall or the other of the flash, or perhaps such bars may, for specialrequirements, be positioned medially of the flask with an interveningspace to accommodate a portion of the pattern intermediate the end ofthe bar and the flask wall. In any event, the arms 7 of such bars are ofsuflicient length to overhang the side walls of the flask as isillustrated in the drawings. Other bars may be of greater or lessvertical dimension. As another variation, such bars are sometimes wideat one end, and comparatively narrow at the other, thus forming atriangular or wedge-shaped bar, which will more readily conform to aFig. 1.

' KT anchor bar cannot be employed.

pattern of inclined shape. There is shown at 8 in Fig. 1, a stillfurther variation wherein the bar 2 is wide at its ends but narrowthroughout the medial portion, thus forming an indented or recessedlower margin adapted to straddle a projection upon the pattern to beembedded in the sand mold. As illustrated in Figs. 1 and 2, brackets 9are secured to the interior of the side walls of a flask, havingdownturned or hook-shaped fingers beneath which is engaged alongitudinally disposed anchor rod 10. A rod 10 extends substantiallythe full length of the flask on each side. Clevises 11 straddle thesupporting arms 7 of the anchor bars 2 with their hook-shapedextremities engaging beneath the rod 10. In order to fixedly clamp theanchor bars in their adjusted position, wedges 12 are driven beneath theclevises 11 and intermediate such clevise and the supporting arm 7 ofthe bars. These wedges 12 exert an upward pulling effect upon theclevises causing their hook ends to firmly engage with the rod 10 and atthe same time exert a downward pressure upon the supporting arm 7 of theanchor bars to clamp such arms against the top margins of the flask.

In the event that it is found that a particu lar anchor bar 2 interfereswith the pattern,

. or if the anchor bar selected happens to be of greater depth than thatof the flask, blocks of wood or shims 13 may be inserted beneath thesupporting arms 7 of such bar and the margin of the flask wall asillustrated in Clevises 11 of different lengths are provided for suchcontingencies. Insertion of the wedge 12 beneath the clevice 11 in suchcase not only clamps the anchor bar 2 but also the inserted block orshim employed for elevating the bar relative to the pattern and theflask.

It frequently becomes necessary to anchor the sand mold intermediate thepattern and the side wall of the flask where a continuous The presentpractice is to nail blocks of wood or short wing sections interiorly ofthe flask. In the present construction, however, cast metal grids orwing bars 15 are provided which are engageable in any desired positionwith the rods 10. These wing bars 15 are also formed in various shapesand sizes, so that the molder may have an assortment from which toselect a wing bar applicable to a particular job. Such wing barscomprise open or perforated frames and are formed at one side with anindentation 16, the outer side of which is flattened into a finger 17for insertion behind the rod 10, which, when the wing bar is properlypositioned, extends through the indentation 16. A wedge 18 is thendriven tig tiy behind the rod 10 and intermediate such rod and theflattened finger 17 thereby firmly clamping the fingers 17 of such Wingbar against the interior side wall of the flask. Obviously thetransverse bar 2 and the Wing bars 15 may be engaged in variouspositions along the rod 10 as is necessitated by the general shape andproportion of the pattern to be embedded within the sand.

Not only are the sand anchor elements formed straight for transversepositions across the flask and short for positions intermediate apattern and the flask wall, but they are also formed circular andrectangular for use more particularly in association with patternshaving large open areas. Such construction is shown in Figs. 3 to 6inclusive. Such circular, rectangular or other circuitous shapes ofanchor members whetheroval,elliptical or polygonal, not only serves toanchor and support the sand, as do the bars 2 and Wings 15, but theyalso effect a very material saving of sand and minimize the laborrequirement in embedding a pattern. For example, when it is desired tocast a. body having a large circular opening such as the bodyillustrated in Figs. 4 and 5, a circular anchor member, as illustratedat 20 in Fig. 3 is employed interiorly of the open area of such patternor body. Such anchor member as shown in Figs. 3, 4 and 5, is of circularform having marginal flanges 21 at its top and bottom. Such members areprovided with radially projecting arms 22 projecting exteriorly of theanchor member and sometimes are provided with other arms 23 projectinginteriorly thereof. These arms 22 may be utilized to support the anchormember 20 in the same manner that the supporting arms 7 are employed byresting the arms 22 upon the margins of a flask and clamping them inposition by clevises 11 and wedges 12. In the particular constructionshown in Figs. 3 and 4, however, the anchor member 20 is supported uponan independent bar 24 positioned across the flask and secured byclevises 11 and wedges 12 as before described. The anchor member 20 isthen supported upon such transverse bar by additional clevises 11 andwedges 12 in the same manner. If the anchor member 20 selected does notpossess the necessary depth to correspond with the flask, two or more ofsuch members may be interconnected by means of clevises and clampingwedges, as is illustrated in Fig. 1. When such sand anchor members arepositioned interiorly of the open area of a pattern, as shown in Fig. 4,it is necessary to 1 compact sand intermediate such supporting member 20and the pattern but the area interiorly of the member 20 is left open.Other wise, under the usual foundry practice, it

would be necessary to fill the entire open space of the pattern withmolding sand. Not only does this require a large quantity of sand, butthe labor of tamping and compacting such sand is a very considerableitem of expense, and when a large open area must thus be filled withsand, the sand within such space being unsupported is likely to collapseand the mold be destroyed. By the use of the circuitous supportingelement such as shown at 20, a lesser quantity of sand being employedthere is not the weight of sand to be lifted and held in place, and suchmember effectually supports and reinforces the lesser quantity of sandto form the mold exteriorly of such supporting member 20. Suchsupporting member is perforated as indicated at 25 to vent the mold andpermit the free escape of gases. This is an additional advantage of thistype of supporting member. Thebody of sand intermediate the supportingmember 20 and the casting being comparatively narrow, the heat and gasesgenerated by pouring the molten metal into the mold is freely ventedthrough the perforations 25 of the anchor member 20. In Fig. 6 there isshown a similar method of operation wherein a rectangular metal frame isto be cast. This frame is shown in cross section at 26. The upper andlower portions of the frame are embedded respectively in the cope anddrag of the flask. The common practice is to fill the entire interior ofthe flask with molding sand suitably supported by transverse woodenslats or bars fixed in the cope of the flask. In the present method,however, a rectangular supporting member 20 is employed interiorly ofthe pattern of the frame to be cast. By this means the mold sand isconfined to a comparatively small portion of the flask intermediate suchsupport or anchor member 20 and the side walls of the flask, leaving theentire interior portion of the'flask open. Like the circular form ofsupporting member 20, the present rectangular form is provided with topand bottom outturned flanges which afford anchorage engagement with thesand. The web portion of sucn member is perforated at comparativelyclosely spaced intervals to afford vent openings for escape of heat andgases during the pouring of the casting. The support member 20 isprovided at intervals with laterally extending arms 7 wh ch overhang thetop margins of the flask in quite the same manner that the supportingarm 7 of the bars 2 so engage. These arms 7 are fixedly engaged with theflask by means of clamping clevises and wedges to secure the supportingmember 20 in predetermined relative position interiorly of the flaskwall.

In lieu of the attachment rod 10 located interiorly of the flask wallswith wh ch the clevises 11 engage, there is shown in Figs. 3 and 7 analternative construction wherein a metal plate 27 is secured to theinner wall of the flask, the top margin of which is overturned in aninverted channel form, as at 28. The ends of the plate 27 are bent atright angles, as indicated at 29, and secured to the end walls of theflask to afford reinforcement of the flask. The plate 27 is so locatedupon the wall of the flask that its lower margin projects in overlappingrelation with the wall of the drag or cheek of the flask as the case maybe to afford an antirunout strip. Such overlapping relation is indicatedat 30 in Fig. 7. By th s means, the walls of the wooden flask areprotected against burning by the leakage of molten metal. The plate 27and wall of the flask to which it is attached are preferably perforatedat intervals beneath the overturned top flange 28, as indicated at 31,to afford ventopenings through which and heated vapors may escape.IVhile this inverted channel will be more or less completely filled withsand, such sand. will be loose since it cannot be eii'ectnally compactedor tamped therein, and consequently the inverted flange aflords an easyescape passage for the heated gases and vapors. The primary purpose ofthis flange, however, is to afford attachment means for the clampingclevices 11. Instead of hooking the lower ends of such clevises aboutthe rod 10, such hooked extremities are engaged beneath the down-turnedmarginal flange 28 of the plate 27 and the anchor bar or supportingmember of whatever shape may be desire c s secured by a clamping wedgedriven under the bight of tie clevis as before described, and asillustrated in Figs. 3 and 7.

Such. construction whether embodying the rod 10 or the flanged plate 27enables the anchor bars or supports to be coupled therewith at anydesired point throughout the length of the flask. Such sand anchor orsupporting members may be shifted to and fro as found necessary ordesirable when accommodating the flask to the pattern.

In lieu of the anchor rod 10 or flanged plate 27, the flask may beprovided with inverted hooks 83 at spaced intervals upon the outside ofthe flask with which clevis links may be engaged. For such use, theclevises may consist of closed links preferably of rectangular, form,such as is shown at 11' in Fig. 6. The clev ses and engaged bars or armsare secured by means of the wedges 12 in the manner heretoforedescribed. Aside from the increased range of adjustability afforded bythe anchor rod 10 or the flanged plate 27. these exterior hooks 33 willperform all of the essential functions in securing the lifting or sandanchor bars or frame.

After the metal has been cast and allowed to partially cool, the sandand casting are shaken out of the flask. \Vhen using old style flaskshaving fixed anchor bars, it was necessary to hammer the sdes of theflask in order to loosen the sand in many instances. With the presentdetachable anchor bar construction, it is only necessary to loosen theanchor bars by knocking out the locking wedges 12 whereupon upon liftingthe flask, the entirebody of the sand mold with the enclosed castingwill readily fall from the flask.

In Fig. 8 there is shown a typical round metal flask within which one ofthe present lifting members 20 is shown suspended from a transversesupporting bar 24. The disclosure of Fig. 8 is intended only as anextreme illustration of the relative adjustment of which the presentconstruction is capable. In this figure, the transverse supporting bar24 is shown elevated at one end by an interposed shiIn-block 84 to anextremely inclined position relative to the cope 1 of the flask.

Thetransverse supporting bar is secured in such inclined position withone end resting upon the elevating block 34 by means of clevis links 11engaging with exterior hooks 33 upon the cope 1. The clevis links 11 arelocked or tightened by means of the locking wedges 12. Suspendedmedially from the transverse bar 24 is an annular lifting member 20 suchas is also shown in Figs. 3, 4 and 5. However, in Fig. 8 this liftingmember 20 is suspended in an inclined or askew postion where it is heldby interposed shims or spaceblocks 35 interposed between one side of theannular lifting member 20 and the supporting barv 24. The lifting member20 is secured to the bar 24 in its suspended position by means of theclevis link 11' which engage with the inwardly projecting arms 23 of themember 20 and are tightened by the locking wedges 12. lVhile it is manytimes desirable to support any one or more of the various forms oflifting members or anchor bars in an inclined position, the inclinationof the supporting bar 24 and the lifting member 20 in F ig.-8 are verymuch exaggerated.

As a further means of anchoring the sand mold and also of reducing thebulk or quantity of the sand, there are provided removable corner plates36, shown more particularly in Figs. 9 and 10 but also shown in Fig. 3.It is more of common practice to secure fixedly within a flask, diagonalcorner blocks or partitions of wood. The present removable corner plates36 enable such diagonal plates of various lengths to be employed so thatthe capacity of the flask may be varied. Such corner plates orpartitions are formed from metal plates, preferably though notnecessarily perforated, having their opposite margins flanged in reversedirections. The top flange 37 of such corner plate is comparatively wideto overhang and rest upon a supporting bar 38 laid diagonally acrosstheflask and resting upon the end and side walls. The lower marginalflange 39 of the corner plate. 36 is'for, the purposeof engaging andsupporting the sand body and is of somewhat less width. The cornerplates 36 and their supporting bars 38 are securely clamped in positionby disposing thereacross a'transverse bar 24 or by resting thereon theextended arm 7 of the anchor bars 2. Such supporting bars 24 or the arms7, as the case may be, are secured in position and in clampingengagement with the underlying corner plates 36' and theirsupportingbars 38 by means of the clevis links 11 wh'ch are tightened bymeans of the wedges 12. By providing such corner plates 36 of variouslengths as well as various depths, flasks may be accommodated to thesize of the pattern and the quantity of sand necessary to fill unneededcorners of the flask is materially reduced.

To enable the flask to be lifted and turned as may be needed, it isusual to provide trunnions on the sides of the flask, which may beengaged with the lifting chains of an over head crane or the like. Toeconomize space on the molding floor, it is desirable that the flasks bepositioned closely adjacent to each other. The presence of theprojecting trunnions interferes more or less with the close positioningof such flasks upon a molding floor. In the present construction thereis provided a detachable trunnion 4O engageable with a socket 41 securedto the side of the flask 1, as illustrated in Fig. 1. This socket ispreferably formed with an interior bayonet slot while the detachabletrunnion 40 carries a projecting lug 42 for interlocking engagementwithin the bayonet slot of the socket 41. By thus detaching thetrunnions 40, the flasks may be set more closely together.

From the above description it will be apparent that there is thusprovided a device of the character described possessing the particularfeatures of advantage before enumerated as desirable, but whichobviously is su ceptible of modification in its form, proportions,detail construction and arrangement of parts without departing from theprinciple involved or sacrificing any of its advantages.

While in order to comply with the statute the invention has beendescribed in language more orless specific as to structural features, itis to be understood that the invention is not limited to the specificdetaiis shown, but thatthe means and construction herein disclosedcomprise the preferred form of several modes of putting the inventioninto effect and the invention is, therefore, claimed in any of its formsor modifications within the legitimate and valid scope of the ap pendedclaims.

Having thus described my invention, 1 claim:

1. The combination with a molders flask, of a plurality of sand anchorbars detachably engageable therewith, including an open frame-likeportion extendingwithin the flask, lateral arms upon the frameoverhanging the side walls of the flask. clevises engaged with the flaskthrough which the arms extend, and

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clamp wedges insertable beneath the clevises for clam pin the arms inengagement with the flask walls.

2. The combination with a molders flask of a sand bar thereforcomprising an open frame-like portion for projection within the flask.and terminal arms thereon overhangin g the flask walls, attachment linksengageable with the flask walls and overhanging the terminal arms, andmeans for tightening the engagement of the links and terminal arms forclamping the bar against the edge face of the flask wall.

3. The combination with a molders flask, of a sand lifting bar thereforincluding an open frame-like portion for projection within the flask andterminal arms overhanging the flask walls, attachment links havingsliding connection with the flask walls and en gaging with said arms,and means for tightening the engagement of the links to clamp the sandbar in adjusted position.

at. The combination with a molders flask, of a sand lifting bar thereforcomprising a medial open frame-like portion for projection within aflask, and terminal arms overhanging the walls of the flask. attachmentlinks for coupling the arms to the flask walls and an anchor membercarried by the wall of the flask with which the links are. engageable indifferent positions of adjustment longitudinally of the flask.

5. The combination with a molders flesk, of an anchor member mountedupon the inner side of the flask wall and a sand lifting membercomprising a frame-like portion for embedment within a body of sandwithin the flask, and an arm projecting from said framelike portion andbearing upon the top marof the flask wall and detachable clamping meansengaging with the anchor member and exerting vertical clamping pressureupon the arm into engagement with the flask wall against the resistanceof said anchorage member.

6. The combination with a molders flask of a. longitudinally disposedanchorage member upon the inner side of the flask wall and a pluralityof vertically adjustable sand lifting bars and means for fixedlyengaging the bars therewith at indeterminate points throughout theextent of said anchorage member.

i. The combination with a molders flask, of a reversely flanged platesecured to the inner side of the flask wall with its margin opposite itsreverse flange extending beyond the margin of the flask into overlappingrelation with a succeeding section of the flask, a series of sand anchorbars and connector means to hold the said bars in detachable engagementwith the reverse flange of said plate.

8. The combination with a molders flask, of a longitudinally disposedanchorage member mounted upon the wall of the flask, a sand lifting barhaving an open frame-like por tion for embedment in a body of sand inthe flask, a portion engaging the wall of the flask and clamp meansengaging with said anchorage member and with the wall engaging portionof the sand lifting bar for detachably securing the latter in adjustedposition.

9. The combination with a molders flask, of a sand supporting member tobe positioned interiorly of the mold for confining nold sandintermediate the saidmember and the flask wall, said supporting memberbeing exteriorly flanged for engagement with the sand mold andperforated for venting the mold, arms upon said member for supportingthe member upon the wall of the flask and clamping means for securingthe arms in adjusted position.

10. A flask section to contain the mold, a I

circuitous wall member in spaced relation with the walls of the flaskforming a circuitous sand mold intermediate the wall member and the wallof the flask and leaving the interior of said mold open and adjustabletie members bridging the mold space intermediate the said walls anddetachably interconnecting them with each other.

1.1. The combination with a molders flask, of a sand supporting memberadj ustably carried thereby in inwardly spaced relation with the wallsof the flask whereby the sand mold is confined between said member andthe walls of the flask, the space interiorly of the sand supportingmember being open, and means for detachably connecting said member withthe walls of'the flask.

12. The combination with a molders flask, of a sand supporting memberseparating the interior of the flask into inner and outer compartment-s,whereby a sand mold for a casting having an open interior may be formedin the outer compartment, the inner compartment being, left empty, saidsupporting member be ing flanged for anchorage engagement with thesand-of the mold and perforated to vent the mold into the innercompartment, and means for detachably connecting said sand supportingmember with the flask.

13. The combination with a molders flask, of supporting bars restingupon the margins of the flask, links overhanging the bars and jconnected with the flask, and wedges for tightening said links to clampthe supporting bars in adjusted positions.

14. In a molders flask, a flask section and relatively adjustabledetachable continuous circuitous partition walls therein for c0nfiningthe molding sand to the portion of the flask adjacent its side wallsleaving the central portion of the flask open, whereby the shape of themold is made to conform more nearly to the contour of the piece to becast thereby conserving mold material. and means for removablysupporting said partition Walls upon the flask section in adjustedposition relative thereto.

15. The combination with a molders flask, of removable corner partitionsdiagonally disposed across the corners of the flask for excludingmolding sand from the corner space and means for detachably securingsaid corner partitions in adjusted position.

16. A sand lifting bar for molders flasks comprising a metal frameincluding mullions dividing the frame into a plurality of open spaces,the top margin of the frame being flat and laterally flanged, the bottommargin of the frame being thickened to form lateral marginal beads ofsubstantially convex form, said beads being roughened by notching, andterminal arms substantially coincident with the top margin of the openframe extending in opposite directions beyond said frame portion.

17. The combination with a molding flask of a sand supporting memberpositioned interiorly of the flask in substantially parallel spacedrelation with the walls of the flask to form therebetween a circuitousmold space to receive mold sand, and tie means bridging suchintermediate mold space beyond the limits thereof and detachablyconnecting the inner sand supporting member with the flask.

18. A sand mold in which is to be formed a continuous circuitous sandmold body having an open interior, including relatively spaced outer andinner walls, the sand mold body being confined between said spacedretaining walls, a supporting bar resting on the outer walls andextending across the mold, and clamp means for releasably securing saidsupporting bar to both said walls.

19. The combination with a molding flask of an anchor member extendingin substantially parallel longitudinal spaced relation with the sidewall of the flask, of sand supporting wings, ears on said wingslaterally adjustable relative to the flask wall upon said anchor memberinsertable intermediate the anchor member and the flask wall and meansfor clamping the wings in adjusted relation with the flask wall.

20. The combination with a molding flask of sand supporting wingslaterally adjustable relative to the side walls of the flask andextending thence inwardly in perpendicular relation with the side wallsof the flask and clamp means for detachably securing the wings inadjusted relation.

21. A sand supporting wing for a molding flask comprising an open framelike structure divided by transverse integral bars into a grille likestructure, and flat bearing portions formed at one margin thereof anddisposed in perpendicular relation to the general plane of the structurefor abutting engagement with the interior wall of a molding flask forlateral sliding movement relative thereto and from which the wing willproject in cantilever relation and means for securing the Wings in anyone of various positions of lateral sliding adjustment.

In testimony whereof, I have hereunto set my hand this 31 day of AugustA. D. 1929. GEO. H. KRAMER.

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